A co-brokerage agreement is a written contract between two real estate brokerages that sets out how they will divide the commission on a single transaction. One firm usually represents the seller, the other the buyer, and the document fixes the split, the scope of the deal, and who is responsible for what. Since the National Association of REALTORS® settlement took effect in August 2024, the terms of these agreements have to be negotiated directly between the firms rather than read off the MLS.
What Belongs in the Agreement
The compensation clause is the center of the document. It can be written as a percentage of the sales price, a share of the gross commission, or a flat dollar amount. Whatever form it takes, it should tie the arrangement to a specific property address or named client so neither firm can later argue the agreement reaches transactions it was never meant to cover. A firm expiration date keeps the arrangement from outliving the listing period.
Division of labor comes next. One broker typically handles marketing, seller communication, and open houses; the other schedules inspections, coordinates appraisal access, and manages the buyer side. Writing this down heads off the finger-pointing that surfaces when something slips through the cracks during escrow. The listing broker almost always keeps lead communication with the seller so the seller is not hearing different things from two firms.
Indemnification language is worth insisting on. A hold-harmless clause requiring each brokerage to answer for its own agents’ errors and misconduct keeps one firm’s mistake from pulling the other into liability it had no part in creating.
Given the post-settlement environment, add a clause addressing what happens if the buyer-broker agreement caps the cooperating broker’s compensation below what the co-brokerage split contemplates. The written buyer-broker agreement sets the ceiling on what the buyer’s agent can collect from any source, so the co-brokerage number has to live underneath that cap.
Why the 2024 NAR Settlement Changed the Negotiation
Before August 2024, a listing broker could publish an offer of compensation to buyer brokers on the MLS, and a cooperating broker could see the number before showing a property. That is gone. The MLS can no longer accept listings containing any offer of compensation to buyer brokers or other buyer representatives, and it cannot run a workaround platform that aggregates those offers from multiple firms.1National Association of REALTORS®. Summary of 2024 MLS Changes
Sellers who want to offer buyer-agent compensation can still do so through flyers, emails, brokerage websites, yard signs, or direct communication between agents. Seller concessions can still appear on the MLS, but those concessions cannot be conditioned on or tied to payment to a buyer broker.2National Association of REALTORS®. Compensation, Commission and Concessions
On the buyer side, every MLS participant working with a buyer must execute a written buyer-broker agreement before touring any home, including live virtual tours. That agreement has to disclose the specific amount or rate of compensation the buyer’s agent will receive, stated in an objectively measurable way, with a cap preventing the agent from collecting more than the agreed amount from any source, plus a conspicuous statement that broker fees are not set by law and are fully negotiable.3National Association of REALTORS®. Written Buyer Agreements 101
The practical effect for co-brokerage is that the cooperating broker’s compensation no longer flows automatically from MLS data. The listing broker and cooperating broker negotiate the split directly and then memorialize it in the co-brokerage agreement before or during the transaction.
What Makes the Agreement Enforceable
It has to be in writing. Under the Statute of Frauds, a verbal promise about commission sharing carries no legal weight and cannot compel payment if the dispute reaches court. Every participant must hold an active real estate license both when the agreement is signed and when the transaction closes. Paying a commission share to an unlicensed person violates licensing laws in every state.
Who signs matters as much as what is signed. Most states require the signature of a managing or supervising broker rather than a sales associate. A sales agent signing on behalf of a firm without authorization can make the entire contract voidable, leaving the cooperating broker with no enforceable claim to any portion of the commission. Both firms should also confirm they are in good standing with their state regulatory board before execution.
Federal Rules That Constrain the Split
The Real Estate Settlement Procedures Act generally prohibits kickbacks and unearned fees in connection with federally related mortgage loans, but federal law carves out an explicit exception for co-brokerage arrangements. Under 12 U.S.C. § 2607(c)(3), payments made through cooperative brokerage and referral arrangements between real estate agents and brokers are not treated as prohibited kickbacks.4Office of the Law Revision Counsel. United States Code Title 12 – 2607 Prohibition Against Kickbacks and Unearned Fees
The exception is narrower than it looks. It applies only when all parties are acting in a real estate brokerage capacity. A split between a real estate broker and a mortgage broker does not qualify, and neither does an arrangement between two mortgage brokers.5eCFR. 12 CFR 1024.14 – Prohibition Against Kickbacks and Unearned Fees The regulation also prohibits splitting fees for settlement services when no actual work was performed. If a cooperating broker collects a share of the commission but provided only nominal services, that payment can be classified as an unearned fee in violation of RESPA.6Consumer Financial Protection Bureau. Prohibition Against Kickbacks and Unearned Fees (12 CFR 1024.14) Document the services each firm actually performed.
Antitrust law sets a separate boundary. Two brokerages can negotiate whatever split they want on a particular deal, but they cannot agree to standardize commission rates across multiple transactions or coordinate pricing with other firms. Every co-brokerage agreement should reflect a genuinely negotiated arrangement for that specific property, not a standing rate the firms apply to all deals. Price-fixing violations in real estate are treated as “per se” illegal under the Sherman Antitrust Act, meaning no justification or defense is accepted.7Office of the Law Revision Counsel. United States Code Title 15 – 1 Trusts, etc., in Restraint of Trade Illegal8Federal Trade Commission. The Antitrust Laws
Cooperating Across State Lines
Real estate licensing is regulated at the state level, and most states allow a local broker to share earned commission with an out-of-state broker as long as the out-of-state broker does not conduct negotiations within the state where the property sits. In practice, the out-of-state broker can refer the client and collect a referral fee, but all on-the-ground activity must be handled by someone licensed locally. Check both states’ licensing rules before signing anything.
Procuring Cause and Why the Agreement Matters
Procuring cause is the legal concept that determines which broker actually earned the commission. Courts and arbitration panels look at whether a broker’s efforts set in motion an unbroken chain of events leading to the completed sale. There is no single bright-line test. Decision-makers weigh the nature and extent of each broker’s involvement, whether gaps occurred in the transaction timeline, and whether the buyer or seller abandoned one broker before engaging another. A clear co-brokerage agreement sidesteps most procuring-cause disputes by defining upfront who earns what. The concept still matters if the agreement is ambiguous or the transaction takes an unexpected turn.
Disputes, Insurance, and Reporting
Commission disputes between brokerages are common enough that an entire infrastructure exists for resolving them outside court. For members of the National Association of REALTORS®, Article 17 of the Code of Ethics requires that contractual disputes between REALTORS® at different firms go through mediation (if the local board mandates it) and then arbitration rather than litigation.9National Association of REALTORS®. Statements of Professional Standards Policy Applicable to Arbitration Proceedings All local REALTOR® associations are required to offer mediation for disputes that would otherwise be arbitrable.10National Association of REALTORS®. Mediation The local board can decline arbitration if the amount at stake is too small or the legal issues too complex, which releases both parties to go to court. For brokers who are not REALTOR® members, commission disputes go directly to civil litigation unless the co-brokerage agreement itself contains an arbitration or mediation clause. Including one is almost always a good idea; litigation over a commission split can easily cost more in legal fees than the disputed amount.
Most states require active real estate licensees to carry errors and omissions insurance covering all activities that require a license. In a co-brokered transaction, each firm’s E&O policy should cover its own agents’ work on the deal. The gap to watch for is whether a cooperating broker’s policy covers claims arising from a property the broker did not list. Many policies do, but coverage limits and deductibles can differ between the two firms. If an agent leaves one brokerage for another mid-transaction, tail coverage may be needed to bridge the gap. Confirm that both firms carry adequate E&O coverage before signing, and make sure the indemnification clause addresses what happens if one firm’s coverage lapses.
On the reporting side, when a listing brokerage pays $600 or more to a cooperating brokerage, the listing firm must file IRS Form 1099-NEC reporting that payment as nonemployee compensation. The IRS instructions specifically list fee-splitting and referral fees between professionals as reportable payments.11Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC Both the IRS filing and the payee statement are due by January 31 of the year following payment. Keep the signed agreement, closing disclosure, and payment records together; they document both sides of the transaction if questions arise later.